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n in (-oo:+oo)
4-2*n = 16/3 // - 16/3
4-2*n-(16/3) = 0
4-2*n-16/3 = 0
-2*n-4/3 = 0 // + 4/3
-2*n = 4/3 // : -2
n = 4/3/(-2)
n = -2/3
n = -2/3
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